620 Coleoplerological Notices, 1 V. 



confused interstitial punctuation, although the punctures tend to 

 form single lines on the narrower intervals. The punctuation of 

 the prothorax is nearly the same as in grandicoUis, but the vesti- 

 ture throughout the body is much more abundant and conspicuous, 

 and there is a sutural line of broader white scales behind the middle 

 in this species, which is entirely wanting and replaced by the usual 

 fine sparse squamules in grandicoUis. 



3 CalaildrillllS obsoletlis n. sp. — Cylindro-oval, very convex, pol- 

 islied, piceous, the legs and beak bright rufous ; vestiture white, consisting 

 of elongate squamules sparsely placed on the prothorax and elytra, becoming 

 denser and more broadly oval on the latter toward base, especially in a broad 

 line behind the scutellum and toward the humeri, and also along intervals 

 four to six for a short distance behind the middle. Headviith a small frontal 

 fovea, the beak very slender, finely, sparsely punctate, as long as the head 

 and prothorax, strongly, evenly aicuate, the antenna slender, inserted just 

 behind the middle, the first funicular joint slender, as long as the next thre^-, 

 the second one-half as long as the first, all the joints longer than wide except 

 the seventh, which is a little transverse, club small, as long as the preceding 

 four joints combined, rather thin, sparsely pubescent and slightly shining, 

 with the basal joint large. Prothorax very nearly as long as wide ; sides par- 

 allel and broadly arcuate to apical fourth, then rounded and constricted, tlie 

 apex strongly subtubulate ; base broadly, evenly arcuate, the median lobe 

 obsolete ; disk very coarsely, deeply punctate, without distinct impunctate 

 line, the punctures rather uneven in size, form and distribution, but gener- 

 ally separated by distinctly less than their own diameters. Scutellum minute, 

 deeply seated. Ehjira slightly longer than wide, very slightly wider than 

 the prothorax and one-half longer than the latter, ovalo-conoidal, narrowly 

 rounded behind ; disk rather coarsely, deeply striate, the intervals fiat, from 

 two to three times as wide as the stri:e, each with a single line of fine distant 

 and inconspicuous punctures. Length 2.8 nmi. ; width 1.25 mm. 



Colorado. 



Readily distinguishable from grandicoUis and insignis by tlie 

 much coarser, sparser punctures of the pronotum, and the entire 

 absence of a well-defined median impunctate line, the punctures 

 simply becoming sparser at the middle ; the apical margin is, how- 

 ever, broadly impunctate, as in the species mentioned. A single 

 specimen. 



CEKTRINOGYXA n. gen. 



The two species which are referred to this interesting genus, are 

 the most remarkable of the tribe in their wonderful sexual divergen- 

 cies at the apex of the abdomen. In the male, the pygidium is 



